/*

  * Copyright (c) 2001-2003 The ffmpeg Project

  *

  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or

  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either

  * version 2.1 of the License, or (at your option) any later version.

  *

  * FFmpeg is distributed in the hope that it will be useful,

  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public

  * License along with FFmpeg; if not, write to the Free Software

  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  */
 #include "avcodec.h"

 #include "get_bits.h"

 #include "put_bits.h"

 #include "bytestream.h"

 #include "adpcm.h"
 #include "adpcm_data.h"

 /**

  * @file

  * ADPCM decoders

  * First version by Francois Revol (revol@free.fr)

  * Fringe ADPCM codecs (e.g., DK3, DK4, Westwood)

  *   by Mike Melanson (melanson@pcisys.net)

  * CD-ROM XA ADPCM codec by BERO

  * EA ADPCM decoder by Robin Kay (komadori@myrealbox.com)

  * EA ADPCM R1/R2/R3 decoder by Peter Ross (pross@xvid.org)

  * EA IMA EACS decoder by Peter Ross (pross@xvid.org)

  * EA IMA SEAD decoder by Peter Ross (pross@xvid.org)

  * EA ADPCM XAS decoder by Peter Ross (pross@xvid.org)

  * MAXIS EA ADPCM decoder by Robert Marston (rmarston@gmail.com)

  * THP ADPCM decoder by Marco Gerards (mgerards@xs4all.nl)

  *
  * Features and limitations:
  *
  * Reference documents:

  * http://wiki.multimedia.cx/index.php?title=Category:ADPCM_Audio_Codecs
  * http://www.pcisys.net/~melanson/codecs/simpleaudio.html [dead]
  * http://www.geocities.com/SiliconValley/8682/aud3.txt [dead]
  * http://openquicktime.sourceforge.net/
  * XAnim sources (xa_codec.c) http://xanim.polter.net/
  * http://www.cs.ucla.edu/~leec/mediabench/applications.html [dead]
  * SoX source code http://sox.sourceforge.net/

  *
  * CD-ROM XA:

  * http://ku-www.ss.titech.ac.jp/~yatsushi/xaadpcm.html [dead]
  * vagpack & depack http://homepages.compuserve.de/bITmASTER32/psx-index.html [dead]

  * readstr http://www.geocities.co.jp/Playtown/2004/

  */
 

 /* These are for CD-ROM XA ADPCM */

 static const int xa_adpcm_table[5][2] = {

     {   0,   0 },
     {  60,   0 },
     { 115, -52 },
     {  98, -55 },
     { 122, -60 }

 };
 

 static const int ea_adpcm_table[] = {

     0,  240,  460,  392,
     0,    0, -208, -220,
     0,    1,    3,    4,
     7,    8,   10,   11,
     0,   -1,   -3,   -4

 };
 

 // padded to zero where table size is less then 16

 static const int swf_index_tables[4][16] = {

     /*2*/ { -1, 2 },
     /*3*/ { -1, -1, 2, 4 },
     /*4*/ { -1, -1, -1, -1, 2, 4, 6, 8 },
     /*5*/ { -1, -1, -1, -1, -1, -1, -1, -1, 1, 2, 4, 6, 8, 10, 13, 16 }
 };
 

 /* end of tables */
 

 typedef struct ADPCMDecodeContext {

     AVFrame frame;

     ADPCMChannelStatus status[6];

     int vqa_version;                /**< VQA version. Used for ADPCM_IMA_WS */

 } ADPCMDecodeContext;

 static av_cold int adpcm_decode_init(AVCodecContext * avctx)

 {

     ADPCMDecodeContext *c = avctx->priv_data;

     unsigned int min_channels = 1;

     unsigned int max_channels = 2;

     switch(avctx->codec->id) {

     case AV_CODEC_ID_ADPCM_EA:

         min_channels = 2;
         break;

     case AV_CODEC_ID_ADPCM_EA_R1:
     case AV_CODEC_ID_ADPCM_EA_R2:
     case AV_CODEC_ID_ADPCM_EA_R3:
     case AV_CODEC_ID_ADPCM_EA_XAS:

         max_channels = 6;
         break;
     }

     if (avctx->channels < min_channels || avctx->channels > max_channels) {

         av_log(avctx, AV_LOG_ERROR, "Invalid number of channels\n");
         return AVERROR(EINVAL);

     }
 

     switch(avctx->codec->id) {

     case AV_CODEC_ID_ADPCM_CT:

         c->status[0].step = c->status[1].step = 511;
         break;

     case AV_CODEC_ID_ADPCM_IMA_WAV:

         if (avctx->bits_per_coded_sample != 4) {
             av_log(avctx, AV_LOG_ERROR, "Only 4-bit ADPCM IMA WAV files are supported\n");
             return -1;
         }
         break;

     case AV_CODEC_ID_ADPCM_IMA_APC:

         if (avctx->extradata && avctx->extradata_size >= 8) {

             c->status[0].predictor = AV_RL32(avctx->extradata);
             c->status[1].predictor = AV_RL32(avctx->extradata + 4);
         }
         break;

     case AV_CODEC_ID_ADPCM_IMA_WS:

         if (avctx->extradata && avctx->extradata_size >= 2)

             c->vqa_version = AV_RL16(avctx->extradata);
         break;

     default:
         break;
     }

     avctx->sample_fmt = AV_SAMPLE_FMT_S16;

 
     avcodec_get_frame_defaults(&c->frame);
     avctx->coded_frame = &c->frame;
 

     return 0;
 }
 

 static inline short adpcm_ima_expand_nibble(ADPCMChannelStatus *c, char nibble, int shift)

 {
     int step_index;
     int predictor;
     int sign, delta, diff, step;
 

     step = ff_adpcm_step_table[c->step_index];
     step_index = c->step_index + ff_adpcm_index_table[(unsigned)nibble];

     step_index = av_clip(step_index, 0, 88);

 
     sign = nibble & 8;
     delta = nibble & 7;

     /* perform direct multiplication instead of series of jumps proposed by
      * the reference ADPCM implementation since modern CPUs can do the mults
      * quickly enough */

     diff = ((2 * delta + 1) * step) >> shift;

     predictor = c->predictor;
     if (sign) predictor -= diff;
     else predictor += diff;
 

     c->predictor = av_clip_int16(predictor);

     c->step_index = step_index;
 

     return (short)c->predictor;

 }
 

 static inline int adpcm_ima_qt_expand_nibble(ADPCMChannelStatus *c, int nibble, int shift)
 {
     int step_index;
     int predictor;
     int diff, step;
 

     step = ff_adpcm_step_table[c->step_index];
     step_index = c->step_index + ff_adpcm_index_table[nibble];

     step_index = av_clip(step_index, 0, 88);
 
     diff = step >> 3;
     if (nibble & 4) diff += step;
     if (nibble & 2) diff += step >> 1;
     if (nibble & 1) diff += step >> 2;
 
     if (nibble & 8)
         predictor = c->predictor - diff;
     else
         predictor = c->predictor + diff;
 
     c->predictor = av_clip_int16(predictor);
     c->step_index = step_index;
 
     return c->predictor;
 }
 

 static inline short adpcm_ms_expand_nibble(ADPCMChannelStatus *c, int nibble)

 {
     int predictor;
 

     predictor = (((c->sample1) * (c->coeff1)) + ((c->sample2) * (c->coeff2))) / 64;

     predictor += ((nibble & 0x08)?(nibble - 0x10):(nibble)) * c->idelta;

 
     c->sample2 = c->sample1;

     c->sample1 = av_clip_int16(predictor);

     c->idelta = (ff_adpcm_AdaptationTable[(int)nibble] * c->idelta) >> 8;

     if (c->idelta < 16) c->idelta = 16;
 

     return c->sample1;

 }
 

 static inline short adpcm_ct_expand_nibble(ADPCMChannelStatus *c, char nibble)
 {
     int sign, delta, diff;
     int new_step;
 
     sign = nibble & 8;
     delta = nibble & 7;
     /* perform direct multiplication instead of series of jumps proposed by
      * the reference ADPCM implementation since modern CPUs can do the mults
      * quickly enough */
     diff = ((2 * delta + 1) * c->step) >> 3;
     /* predictor update is not so trivial: predictor is multiplied on 254/256 before updating */

     c->predictor = ((c->predictor * 254) >> 8) + (sign ? -diff : diff);
     c->predictor = av_clip_int16(c->predictor);

     /* calculate new step and clamp it to range 511..32767 */

     new_step = (ff_adpcm_AdaptationTable[nibble & 7] * c->step) >> 8;

     c->step = av_clip(new_step, 511, 32767);

     return (short)c->predictor;

 }
 

 static inline short adpcm_sbpro_expand_nibble(ADPCMChannelStatus *c, char nibble, int size, int shift)
 {
     int sign, delta, diff;
 
     sign = nibble & (1<<(size-1));
     delta = nibble & ((1<<(size-1))-1);
     diff = delta << (7 + c->step + shift);
 
     /* clamp result */

     c->predictor = av_clip(c->predictor + (sign ? -diff : diff), -16384,16256);

 
     /* calculate new step */
     if (delta >= (2*size - 3) && c->step < 3)
         c->step++;
     else if (delta == 0 && c->step > 0)
         c->step--;
 
     return (short) c->predictor;
 }
 

 static inline short adpcm_yamaha_expand_nibble(ADPCMChannelStatus *c, unsigned char nibble)
 {
     if(!c->step) {
         c->predictor = 0;
         c->step = 127;
     }
 

     c->predictor += (c->step * ff_adpcm_yamaha_difflookup[nibble]) / 8;

     c->predictor = av_clip_int16(c->predictor);

     c->step = (c->step * ff_adpcm_yamaha_indexscale[nibble]) >> 8;

     c->step = av_clip(c->step, 127, 24567);

     return c->predictor;
 }
 

 static int xa_decode(AVCodecContext *avctx,
                      short *out, const unsigned char *in,
                      ADPCMChannelStatus *left, ADPCMChannelStatus *right, int inc)

 {
     int i, j;
     int shift,filter,f0,f1;
     int s_1,s_2;
     int d,s,t;
 
     for(i=0;i<4;i++) {
 
         shift  = 12 - (in[4+i*2] & 15);
         filter = in[4+i*2] >> 4;

         if (filter >= FF_ARRAY_ELEMS(xa_adpcm_table)) {

             av_log_ask_for_sample(avctx, "unknown XA-ADPCM filter %d\n", filter);

             filter=0;
         }

         f0 = xa_adpcm_table[filter][0];
         f1 = xa_adpcm_table[filter][1];
 
         s_1 = left->sample1;
         s_2 = left->sample2;
 
         for(j=0;j<28;j++) {
             d = in[16+i+j*4];
 

             t = sign_extend(d, 4);

             s = ( t<<shift ) + ((s_1*f0 + s_2*f1+32)>>6);
             s_2 = s_1;

             s_1 = av_clip_int16(s);
             *out = s_1;
             out += inc;

         }
 
         if (inc==2) { /* stereo */
             left->sample1 = s_1;
             left->sample2 = s_2;
             s_1 = right->sample1;
             s_2 = right->sample2;
             out = out + 1 - 28*2;
         }
 
         shift  = 12 - (in[5+i*2] & 15);
         filter = in[5+i*2] >> 4;

         if (filter >= FF_ARRAY_ELEMS(xa_adpcm_table)) {

             av_log_ask_for_sample(avctx, "unknown XA-ADPCM filter %d\n", filter);

             filter=0;
         }

 
         f0 = xa_adpcm_table[filter][0];
         f1 = xa_adpcm_table[filter][1];
 
         for(j=0;j<28;j++) {
             d = in[16+i+j*4];
 

             t = sign_extend(d >> 4, 4);

             s = ( t<<shift ) + ((s_1*f0 + s_2*f1+32)>>6);
             s_2 = s_1;

             s_1 = av_clip_int16(s);
             *out = s_1;
             out += inc;

         }
 
         if (inc==2) { /* stereo */
             right->sample1 = s_1;
             right->sample2 = s_2;
             out -= 1;
         } else {
             left->sample1 = s_1;
             left->sample2 = s_2;
         }
     }

 
     return 0;

 }
 

 static void adpcm_swf_decode(AVCodecContext *avctx, const uint8_t *buf, int buf_size, int16_t *samples)
 {
     ADPCMDecodeContext *c = avctx->priv_data;
     GetBitContext gb;
     const int *table;
     int k0, signmask, nb_bits, count;
     int size = buf_size*8;
     int i;
 
     init_get_bits(&gb, buf, size);
 
     //read bits & initial values
     nb_bits = get_bits(&gb, 2)+2;
     //av_log(NULL,AV_LOG_INFO,"nb_bits: %d\n", nb_bits);
     table = swf_index_tables[nb_bits-2];
     k0 = 1 << (nb_bits-2);
     signmask = 1 << (nb_bits-1);
 
     while (get_bits_count(&gb) <= size - 22*avctx->channels) {
         for (i = 0; i < avctx->channels; i++) {
             *samples++ = c->status[i].predictor = get_sbits(&gb, 16);
             c->status[i].step_index = get_bits(&gb, 6);
         }
 
         for (count = 0; get_bits_count(&gb) <= size - nb_bits*avctx->channels && count < 4095; count++) {
             int i;
 
             for (i = 0; i < avctx->channels; i++) {
                 // similar to IMA adpcm
                 int delta = get_bits(&gb, nb_bits);
                 int step = ff_adpcm_step_table[c->status[i].step_index];
                 long vpdiff = 0; // vpdiff = (delta+0.5)*step/4
                 int k = k0;
 
                 do {
                     if (delta & k)
                         vpdiff += step;
                     step >>= 1;
                     k >>= 1;
                 } while(k);
                 vpdiff += step;
 
                 if (delta & signmask)
                     c->status[i].predictor -= vpdiff;
                 else
                     c->status[i].predictor += vpdiff;
 
                 c->status[i].step_index += table[delta & (~signmask)];
 
                 c->status[i].step_index = av_clip(c->status[i].step_index, 0, 88);
                 c->status[i].predictor = av_clip_int16(c->status[i].predictor);
 
                 *samples++ = c->status[i].predictor;
             }
         }
     }
 }
 

 /**
  * Get the number of samples that will be decoded from the packet.
  * In one case, this is actually the maximum number of samples possible to
  * decode with the given buf_size.
  *
  * @param[out] coded_samples set to the number of samples as coded in the
  *                           packet, or 0 if the codec does not encode the
  *                           number of samples in each frame.
  */

 static int get_nb_samples(AVCodecContext *avctx, GetByteContext *gb,

                           int buf_size, int *coded_samples)
 {
     ADPCMDecodeContext *s = avctx->priv_data;
     int nb_samples        = 0;
     int ch                = avctx->channels;
     int has_coded_samples = 0;
     int header_size;
 
     *coded_samples = 0;
 

     if(ch <= 0)
         return 0;
 

     switch (avctx->codec->id) {
     /* constant, only check buf_size */

     case AV_CODEC_ID_ADPCM_EA_XAS:

         if (buf_size < 76 * ch)
             return 0;
         nb_samples = 128;
         break;

     case AV_CODEC_ID_ADPCM_IMA_QT:

         if (buf_size < 34 * ch)
             return 0;
         nb_samples = 64;
         break;
     /* simple 4-bit adpcm */

     case AV_CODEC_ID_ADPCM_CT:
     case AV_CODEC_ID_ADPCM_IMA_APC:
     case AV_CODEC_ID_ADPCM_IMA_EA_SEAD:
     case AV_CODEC_ID_ADPCM_IMA_WS:
     case AV_CODEC_ID_ADPCM_YAMAHA:

         nb_samples = buf_size * 2 / ch;
         break;
     }
     if (nb_samples)
         return nb_samples;
 
     /* simple 4-bit adpcm, with header */
     header_size = 0;
     switch (avctx->codec->id) {

         case AV_CODEC_ID_ADPCM_4XM:
         case AV_CODEC_ID_ADPCM_IMA_ISS:     header_size = 4 * ch;      break;
         case AV_CODEC_ID_ADPCM_IMA_AMV:     header_size = 8;           break;
         case AV_CODEC_ID_ADPCM_IMA_SMJPEG:  header_size = 4;           break;

     }
     if (header_size > 0)
         return (buf_size - header_size) * 2 / ch;
 
     /* more complex formats */
     switch (avctx->codec->id) {

     case AV_CODEC_ID_ADPCM_EA:

         has_coded_samples = 1;

         *coded_samples  = bytestream2_get_le32(gb);

         *coded_samples -= *coded_samples % 28;
         nb_samples      = (buf_size - 12) / 30 * 28;
         break;

     case AV_CODEC_ID_ADPCM_IMA_EA_EACS:

         has_coded_samples = 1;

         *coded_samples = bytestream2_get_le32(gb);

         nb_samples     = (buf_size - (4 + 8 * ch)) * 2 / ch;
         break;

     case AV_CODEC_ID_ADPCM_EA_MAXIS_XA:

         nb_samples = (buf_size - ch) / ch * 2;

         break;

     case AV_CODEC_ID_ADPCM_EA_R1:
     case AV_CODEC_ID_ADPCM_EA_R2:
     case AV_CODEC_ID_ADPCM_EA_R3:

         /* maximum number of samples */
         /* has internal offsets and a per-frame switch to signal raw 16-bit */
         has_coded_samples = 1;
         switch (avctx->codec->id) {

         case AV_CODEC_ID_ADPCM_EA_R1:

             header_size    = 4 + 9 * ch;

             *coded_samples = bytestream2_get_le32(gb);

             break;

         case AV_CODEC_ID_ADPCM_EA_R2:

             header_size    = 4 + 5 * ch;

             *coded_samples = bytestream2_get_le32(gb);

             break;

         case AV_CODEC_ID_ADPCM_EA_R3:

             header_size    = 4 + 5 * ch;

             *coded_samples = bytestream2_get_be32(gb);

             break;
         }
         *coded_samples -= *coded_samples % 28;
         nb_samples      = (buf_size - header_size) * 2 / ch;
         nb_samples     -= nb_samples % 28;
         break;

     case AV_CODEC_ID_ADPCM_IMA_DK3:

         if (avctx->block_align > 0)
             buf_size = FFMIN(buf_size, avctx->block_align);

         nb_samples = ((buf_size - 16) * 2 / 3 * 4) / ch;

         break;

     case AV_CODEC_ID_ADPCM_IMA_DK4:

         if (avctx->block_align > 0)
             buf_size = FFMIN(buf_size, avctx->block_align);

         nb_samples = 1 + (buf_size - 4 * ch) * 2 / ch;
         break;

     case AV_CODEC_ID_ADPCM_IMA_WAV:

         if (avctx->block_align > 0)
             buf_size = FFMIN(buf_size, avctx->block_align);
         nb_samples = 1 + (buf_size - 4 * ch) / (4 * ch) * 8;
         break;

     case AV_CODEC_ID_ADPCM_MS:

         if (avctx->block_align > 0)
             buf_size = FFMIN(buf_size, avctx->block_align);
         nb_samples = 2 + (buf_size - 7 * ch) * 2 / ch;
         break;

     case AV_CODEC_ID_ADPCM_SBPRO_2:
     case AV_CODEC_ID_ADPCM_SBPRO_3:
     case AV_CODEC_ID_ADPCM_SBPRO_4:

     {
         int samples_per_byte;
         switch (avctx->codec->id) {

         case AV_CODEC_ID_ADPCM_SBPRO_2: samples_per_byte = 4; break;
         case AV_CODEC_ID_ADPCM_SBPRO_3: samples_per_byte = 3; break;
         case AV_CODEC_ID_ADPCM_SBPRO_4: samples_per_byte = 2; break;

         }
         if (!s->status[0].step_index) {
             nb_samples++;
             buf_size -= ch;
         }
         nb_samples += buf_size * samples_per_byte / ch;
         break;
     }

     case AV_CODEC_ID_ADPCM_SWF:

     {
         int buf_bits       = buf_size * 8 - 2;

         int nbits          = (bytestream2_get_byte(gb) >> 6) + 2;

         int block_hdr_size = 22 * ch;
         int block_size     = block_hdr_size + nbits * ch * 4095;
         int nblocks        = buf_bits / block_size;
         int bits_left      = buf_bits - nblocks * block_size;
         nb_samples         = nblocks * 4096;
         if (bits_left >= block_hdr_size)
             nb_samples += 1 + (bits_left - block_hdr_size) / (nbits * ch);
         break;
     }

     case AV_CODEC_ID_ADPCM_THP:

         has_coded_samples = 1;

         bytestream2_skip(gb, 4); // channel size
         *coded_samples  = bytestream2_get_be32(gb);

         *coded_samples -= *coded_samples % 14;
         nb_samples      = (buf_size - 80) / (8 * ch) * 14;
         break;

     case AV_CODEC_ID_ADPCM_XA:

         nb_samples = (buf_size / 128) * 224 / ch;
         break;
     }
 
     /* validate coded sample count */
     if (has_coded_samples && (*coded_samples <= 0 || *coded_samples > nb_samples))
         return AVERROR_INVALIDDATA;
 
     return nb_samples;
 }

 static int adpcm_decode_frame(AVCodecContext *avctx, void *data,
                               int *got_frame_ptr, AVPacket *avpkt)

 {

     const uint8_t *buf = avpkt->data;
     int buf_size = avpkt->size;

     ADPCMDecodeContext *c = avctx->priv_data;

     ADPCMChannelStatus *cs;

     int n, m, channel, i;

     short *samples;
     int st; /* stereo */

     int count1, count2;

     int nb_samples, coded_samples, ret;

     GetByteContext gb;

     bytestream2_init(&gb, buf, buf_size);

     nb_samples = get_nb_samples(avctx, &gb, buf_size, &coded_samples);

     if (nb_samples <= 0) {
         av_log(avctx, AV_LOG_ERROR, "invalid number of samples in packet\n");
         return AVERROR_INVALIDDATA;
     }

     /* get output buffer */
     c->frame.nb_samples = nb_samples;
     if ((ret = avctx->get_buffer(avctx, &c->frame)) < 0) {
         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
         return ret;

     }

     samples = (short *)c->frame.data[0];
 

     /* use coded_samples when applicable */
     /* it is always <= nb_samples, so the output buffer will be large enough */
     if (coded_samples) {
         if (coded_samples != nb_samples)
             av_log(avctx, AV_LOG_WARNING, "mismatch in coded sample count\n");

         c->frame.nb_samples = nb_samples = coded_samples;

     }

     st = avctx->channels == 2 ? 1 : 0;

 
     switch(avctx->codec->id) {

     case AV_CODEC_ID_ADPCM_IMA_QT:

         /* In QuickTime, IMA is encoded by chunks of 34 bytes (=64 samples).
            Channel data is interleaved per-chunk. */

         for (channel = 0; channel < avctx->channels; channel++) {

             int predictor;

             int step_index;

             cs = &(c->status[channel]);
             /* (pppppp) (piiiiiii) */

             /* Bits 15-7 are the _top_ 9 bits of the 16-bit initial predictor value */

             predictor = sign_extend(bytestream2_get_be16u(&gb), 16);

             step_index = predictor & 0x7F;

             predictor &= ~0x7F;

 
             if (cs->step_index == step_index) {

                 int diff = predictor - cs->predictor;

                 if (diff < 0)
                     diff = - diff;
                 if (diff > 0x7f)
                     goto update;
             } else {
             update:
                 cs->step_index = step_index;
                 cs->predictor = predictor;
             }

             if (cs->step_index > 88u){
                 av_log(avctx, AV_LOG_ERROR, "ERROR: step_index[%d] = %i\n",
                        channel, cs->step_index);
                 return AVERROR_INVALIDDATA;

             }

             samples = (short *)c->frame.data[0] + channel;

             for (m = 0; m < 32; m++) {

                 int byte = bytestream2_get_byteu(&gb);
                 *samples = adpcm_ima_qt_expand_nibble(cs, byte & 0x0F, 3);

                 samples += avctx->channels;

                 *samples = adpcm_ima_qt_expand_nibble(cs, byte >> 4  , 3);

                 samples += avctx->channels;
             }

         }
         break;

     case AV_CODEC_ID_ADPCM_IMA_WAV:

         for(i=0; i<avctx->channels; i++){
             cs = &(c->status[i]);

             cs->predictor = *samples++ = sign_extend(bytestream2_get_le16u(&gb), 16);

             cs->step_index = sign_extend(bytestream2_get_le16u(&gb), 16);
             if (cs->step_index > 88u){
                 av_log(avctx, AV_LOG_ERROR, "ERROR: step_index[%d] = %i\n",
                        i, cs->step_index);
                 return AVERROR_INVALIDDATA;

             }

         }
 

         for (n = (nb_samples - 1) / 8; n > 0; n--) {

             for (i = 0; i < avctx->channels; i++) {
                 cs = &c->status[i];
                 for (m = 0; m < 4; m++) {

                     int v = bytestream2_get_byteu(&gb);

                     *samples = adpcm_ima_expand_nibble(cs, v & 0x0F, 3);
                     samples += avctx->channels;
                     *samples = adpcm_ima_expand_nibble(cs, v >> 4  , 3);
                     samples += avctx->channels;
                 }
                 samples -= 8 * avctx->channels - 1;

             }

             samples += 7 * avctx->channels;

         }

         break;

     case AV_CODEC_ID_ADPCM_4XM:

         for (i = 0; i < avctx->channels; i++)

             c->status[i].predictor = sign_extend(bytestream2_get_le16u(&gb), 16);

         for (i = 0; i < avctx->channels; i++) {

             c->status[i].step_index = sign_extend(bytestream2_get_le16u(&gb), 16);
             if (c->status[i].step_index > 88u) {
                 av_log(avctx, AV_LOG_ERROR, "ERROR: step_index[%d] = %i\n",
                        i, c->status[i].step_index);
                 return AVERROR_INVALIDDATA;
             }

         }

         for (i = 0; i < avctx->channels; i++) {

             samples = (short *)c->frame.data[0] + i;

             cs = &c->status[i];

             for (n = nb_samples >> 1; n > 0; n--) {
                 int v = bytestream2_get_byteu(&gb);

                 *samples = adpcm_ima_expand_nibble(cs, v & 0x0F, 4);
                 samples += avctx->channels;
                 *samples = adpcm_ima_expand_nibble(cs, v >> 4  , 4);
                 samples += avctx->channels;
             }
         }

         break;

     case AV_CODEC_ID_ADPCM_MS:

     {
         int block_predictor;
 

         block_predictor = bytestream2_get_byteu(&gb);
         if (block_predictor > 6) {
             av_log(avctx, AV_LOG_ERROR, "ERROR: block_predictor[0] = %d\n",
                    block_predictor);
             return AVERROR_INVALIDDATA;
         }

         c->status[0].coeff1 = ff_adpcm_AdaptCoeff1[block_predictor];
         c->status[0].coeff2 = ff_adpcm_AdaptCoeff2[block_predictor];
         if (st) {

             block_predictor = bytestream2_get_byteu(&gb);
             if (block_predictor > 6) {
                 av_log(avctx, AV_LOG_ERROR, "ERROR: block_predictor[1] = %d\n",
                        block_predictor);
                 return AVERROR_INVALIDDATA;
             }

             c->status[1].coeff1 = ff_adpcm_AdaptCoeff1[block_predictor];
             c->status[1].coeff2 = ff_adpcm_AdaptCoeff2[block_predictor];
         }

         c->status[0].idelta = sign_extend(bytestream2_get_le16u(&gb), 16);

         if (st){

             c->status[1].idelta = sign_extend(bytestream2_get_le16u(&gb), 16);

         }

         c->status[0].sample1 = sign_extend(bytestream2_get_le16u(&gb), 16);
         if (st) c->status[1].sample1 = sign_extend(bytestream2_get_le16u(&gb), 16);
         c->status[0].sample2 = sign_extend(bytestream2_get_le16u(&gb), 16);
         if (st) c->status[1].sample2 = sign_extend(bytestream2_get_le16u(&gb), 16);

 
         *samples++ = c->status[0].sample2;
         if (st) *samples++ = c->status[1].sample2;

         *samples++ = c->status[0].sample1;
         if (st) *samples++ = c->status[1].sample1;

         for(n = (nb_samples - 2) >> (1 - st); n > 0; n--) {
             int byte = bytestream2_get_byteu(&gb);
             *samples++ = adpcm_ms_expand_nibble(&c->status[0 ], byte >> 4  );
             *samples++ = adpcm_ms_expand_nibble(&c->status[st], byte & 0x0F);

         }
         break;

     }

     case AV_CODEC_ID_ADPCM_IMA_DK4:

         for (channel = 0; channel < avctx->channels; channel++) {
             cs = &c->status[channel];

             cs->predictor  = *samples++ = sign_extend(bytestream2_get_le16u(&gb), 16);
             cs->step_index = sign_extend(bytestream2_get_le16u(&gb), 16);
             if (cs->step_index > 88u){
                 av_log(avctx, AV_LOG_ERROR, "ERROR: step_index[%d] = %i\n",
                        channel, cs->step_index);
                 return AVERROR_INVALIDDATA;
             }

         }

         for (n = nb_samples >> (1 - st); n > 0; n--) {
             int v = bytestream2_get_byteu(&gb);

             *samples++ = adpcm_ima_expand_nibble(&c->status[0 ], v >> 4  , 3);
             *samples++ = adpcm_ima_expand_nibble(&c->status[st], v & 0x0F, 3);

         }
         break;

     case AV_CODEC_ID_ADPCM_IMA_DK3:

     {

         int last_byte = 0;
         int nibble;

         int decode_top_nibble_next = 0;
         int diff_channel;

         const int16_t *samples_end = samples + avctx->channels * nb_samples;
 
         bytestream2_skipu(&gb, 10);
         c->status[0].predictor  = sign_extend(bytestream2_get_le16u(&gb), 16);
         c->status[1].predictor  = sign_extend(bytestream2_get_le16u(&gb), 16);
         c->status[0].step_index = bytestream2_get_byteu(&gb);
         c->status[1].step_index = bytestream2_get_byteu(&gb);
         if (c->status[0].step_index > 88u || c->status[1].step_index > 88u){
             av_log(avctx, AV_LOG_ERROR, "ERROR: step_index = %i/%i\n",
                    c->status[0].step_index, c->status[1].step_index);
             return AVERROR_INVALIDDATA;
         }

         /* sign extend the predictors */
         diff_channel = c->status[1].predictor;
 

         /* DK3 ADPCM support macro */
 #define DK3_GET_NEXT_NIBBLE() \
     if (decode_top_nibble_next) { \
         nibble = last_byte >> 4; \
         decode_top_nibble_next = 0; \
     } else { \
         last_byte = bytestream2_get_byteu(&gb); \
         nibble = last_byte & 0x0F; \
         decode_top_nibble_next = 1; \
     }
 
         while (samples < samples_end) {

 
             /* for this algorithm, c->status[0] is the sum channel and
              * c->status[1] is the diff channel */
 
             /* process the first predictor of the sum channel */
             DK3_GET_NEXT_NIBBLE();

             adpcm_ima_expand_nibble(&c->status[0], nibble, 3);

 
             /* process the diff channel predictor */
             DK3_GET_NEXT_NIBBLE();

             adpcm_ima_expand_nibble(&c->status[1], nibble, 3);

 
             /* process the first pair of stereo PCM samples */
             diff_channel = (diff_channel + c->status[1].predictor) / 2;
             *samples++ = c->status[0].predictor + c->status[1].predictor;
             *samples++ = c->status[0].predictor - c->status[1].predictor;
 
             /* process the second predictor of the sum channel */
             DK3_GET_NEXT_NIBBLE();

             adpcm_ima_expand_nibble(&c->status[0], nibble, 3);

 
             /* process the second pair of stereo PCM samples */
             diff_channel = (diff_channel + c->status[1].predictor) / 2;
             *samples++ = c->status[0].predictor + c->status[1].predictor;
             *samples++ = c->status[0].predictor - c->status[1].predictor;
         }
         break;

     }

     case AV_CODEC_ID_ADPCM_IMA_ISS:

         for (channel = 0; channel < avctx->channels; channel++) {
             cs = &c->status[channel];

             cs->predictor  = sign_extend(bytestream2_get_le16u(&gb), 16);
             cs->step_index = sign_extend(bytestream2_get_le16u(&gb), 16);
             if (cs->step_index > 88u){
                 av_log(avctx, AV_LOG_ERROR, "ERROR: step_index[%d] = %i\n",
                        channel, cs->step_index);
                 return AVERROR_INVALIDDATA;
             }

         }
 

         for (n = nb_samples >> (1 - st); n > 0; n--) {
             int v1, v2;
             int v = bytestream2_get_byteu(&gb);

             /* nibbles are swapped for mono */

             if (st) {

                 v1 = v >> 4;
                 v2 = v & 0x0F;

             } else {

                 v2 = v >> 4;
                 v1 = v & 0x0F;

             }

             *samples++ = adpcm_ima_expand_nibble(&c->status[0 ], v1, 3);
             *samples++ = adpcm_ima_expand_nibble(&c->status[st], v2, 3);

         }
         break;

     case AV_CODEC_ID_ADPCM_IMA_APC:

         while (bytestream2_get_bytes_left(&gb) > 0) {
             int v = bytestream2_get_byteu(&gb);

             *samples++ = adpcm_ima_expand_nibble(&c->status[0],  v >> 4  , 3);
             *samples++ = adpcm_ima_expand_nibble(&c->status[st], v & 0x0F, 3);

         }
         break;

     case AV_CODEC_ID_ADPCM_IMA_WS:

         if (c->vqa_version == 3) {
             for (channel = 0; channel < avctx->channels; channel++) {
                 int16_t *smp = samples + channel;

                 for (n = nb_samples / 2; n > 0; n--) {
                     int v = bytestream2_get_byteu(&gb);
                     *smp = adpcm_ima_expand_nibble(&c->status[channel], v >> 4  , 3);
                     smp += avctx->channels;
                     *smp = adpcm_ima_expand_nibble(&c->status[channel], v & 0x0F, 3);
                     smp += avctx->channels;
                 }

             }

         } else {

             for (n = nb_samples / 2; n > 0; n--) {

                 for (channel = 0; channel < avctx->channels; channel++) {
                     int v = bytestream2_get_byteu(&gb);
                     *samples++  = adpcm_ima_expand_nibble(&c->status[channel], v >> 4  , 3);
                     samples[st] = adpcm_ima_expand_nibble(&c->status[channel], v & 0x0F, 3);
                 }
                 samples += avctx->channels;

             }
         }

         bytestream2_seek(&gb, 0, SEEK_END);

         break;

     case AV_CODEC_ID_ADPCM_XA:

         while (bytestream2_get_bytes_left(&gb) >= 128) {
             if ((ret = xa_decode(avctx, samples, buf + bytestream2_tell(&gb), &c->status[0],

                                  &c->status[1], avctx->channels)) < 0)
                 return ret;

             bytestream2_skipu(&gb, 128);

             samples += 28 * 8;
         }
         break;

     case AV_CODEC_ID_ADPCM_IMA_EA_EACS:

         for (i=0; i<=st; i++) {
             c->status[i].step_index = bytestream2_get_le32u(&gb);
             if (c->status[i].step_index > 88u) {
                 av_log(avctx, AV_LOG_ERROR, "ERROR: step_index[%d] = %i\n",
                        i, c->status[i].step_index);
                 return AVERROR_INVALIDDATA;
             }
         }

         for (i=0; i<=st; i++)

             c->status[i].predictor  = bytestream2_get_le32u(&gb);

         for (n = nb_samples >> (1 - st); n > 0; n--) {
             int byte   = bytestream2_get_byteu(&gb);
             *samples++ = adpcm_ima_expand_nibble(&c->status[0],  byte >> 4,   3);
             *samples++ = adpcm_ima_expand_nibble(&c->status[st], byte & 0x0F, 3);

         }
         break;

     case AV_CODEC_ID_ADPCM_IMA_EA_SEAD:

         for (n = nb_samples >> (1 - st); n > 0; n--) {
             int byte = bytestream2_get_byteu(&gb);
             *samples++ = adpcm_ima_expand_nibble(&c->status[0],  byte >> 4,   6);
             *samples++ = adpcm_ima_expand_nibble(&c->status[st], byte & 0x0F, 6);

         }
         break;

     case AV_CODEC_ID_ADPCM_EA:

     {

         int previous_left_sample, previous_right_sample;
         int current_left_sample, current_right_sample;
         int next_left_sample, next_right_sample;
         int coeff1l, coeff2l, coeff1r, coeff2r;
         int shift_left, shift_right;

         /* Each EA ADPCM frame has a 12-byte header followed by 30-byte pieces,
            each coding 28 stereo samples. */

         if(avctx->channels != 2)
             return AVERROR_INVALIDDATA;
 

         current_left_sample   = sign_extend(bytestream2_get_le16u(&gb), 16);
         previous_left_sample  = sign_extend(bytestream2_get_le16u(&gb), 16);
         current_right_sample  = sign_extend(bytestream2_get_le16u(&gb), 16);
         previous_right_sample = sign_extend(bytestream2_get_le16u(&gb), 16);

         for (count1 = 0; count1 < nb_samples / 28; count1++) {

             int byte = bytestream2_get_byteu(&gb);
             coeff1l = ea_adpcm_table[ byte >> 4       ];
             coeff2l = ea_adpcm_table[(byte >> 4  ) + 4];
             coeff1r = ea_adpcm_table[ byte & 0x0F];
             coeff2r = ea_adpcm_table[(byte & 0x0F) + 4];

             byte = bytestream2_get_byteu(&gb);
             shift_left  = 20 - (byte >> 4);
             shift_right = 20 - (byte & 0x0F);

 
             for (count2 = 0; count2 < 28; count2++) {

                 byte = bytestream2_get_byteu(&gb);
                 next_left_sample  = sign_extend(byte >> 4, 4) << shift_left;
                 next_right_sample = sign_extend(byte,      4) << shift_right;

                 next_left_sample = (next_left_sample +
                     (current_left_sample * coeff1l) +

                     (previous_left_sample * coeff2l) + 0x80) >> 8;

                 next_right_sample = (next_right_sample +
                     (current_right_sample * coeff1r) +

                     (previous_right_sample * coeff2r) + 0x80) >> 8;
 
                 previous_left_sample = current_left_sample;

                 current_left_sample = av_clip_int16(next_left_sample);

                 previous_right_sample = current_right_sample;

                 current_right_sample = av_clip_int16(next_right_sample);

                 *samples++ = current_left_sample;
                 *samples++ = current_right_sample;

             }
         }

         bytestream2_skip(&gb, 2); // Skip terminating 0x0000

         break;

     }

     case AV_CODEC_ID_ADPCM_EA_MAXIS_XA:

     {
         int coeff[2][2], shift[2];
 

         for(channel = 0; channel < avctx->channels; channel++) {

             int byte = bytestream2_get_byteu(&gb);

             for (i=0; i<2; i++)

                 coeff[channel][i] = ea_adpcm_table[(byte >> 4) + 4*i];
             shift[channel] = 20 - (byte & 0x0F);

         }

         for (count1 = 0; count1 < nb_samples / 2; count1++) {

             int byte[2];
 
             byte[0] = bytestream2_get_byteu(&gb);
             if (st) byte[1] = bytestream2_get_byteu(&gb);

             for(i = 4; i >= 0; i-=4) { /* Pairwise samples LL RR (st) or LL LL (mono) */
                 for(channel = 0; channel < avctx->channels; channel++) {

                     int sample = sign_extend(byte[channel] >> i, 4) << shift[channel];

                     sample = (sample +
                              c->status[channel].sample1 * coeff[channel][0] +
                              c->status[channel].sample2 * coeff[channel][1] + 0x80) >> 8;
                     c->status[channel].sample2 = c->status[channel].sample1;
                     c->status[channel].sample1 = av_clip_int16(sample);
                     *samples++ = c->status[channel].sample1;
                 }
             }
         }

         bytestream2_seek(&gb, 0, SEEK_END);

         break;

     }

     case AV_CODEC_ID_ADPCM_EA_R1:
     case AV_CODEC_ID_ADPCM_EA_R2:
     case AV_CODEC_ID_ADPCM_EA_R3: {

         /* channel numbering
            2chan: 0=fl, 1=fr
            4chan: 0=fl, 1=rl, 2=fr, 3=rr
            6chan: 0=fl, 1=c,  2=fr, 3=rl,  4=rr, 5=sub */

         const int big_endian = avctx->codec->id == AV_CODEC_ID_ADPCM_EA_R3;

         int previous_sample, current_sample, next_sample;
         int coeff1, coeff2;
         int shift;

         unsigned int channel;
         uint16_t *samplesC;

         int count = 0;

         int offsets[6];

         for (channel=0; channel<avctx->channels; channel++)
             offsets[channel] = (big_endian ? bytestream2_get_be32(&gb) :
                                              bytestream2_get_le32(&gb)) +
                                (avctx->channels + 1) * 4;

 
         for (channel=0; channel<avctx->channels; channel++) {

             bytestream2_seek(&gb, offsets[channel], SEEK_SET);

             samplesC = samples + channel;
 

             if (avctx->codec->id == AV_CODEC_ID_ADPCM_EA_R1) {

                 current_sample  = sign_extend(bytestream2_get_le16(&gb), 16);
                 previous_sample = sign_extend(bytestream2_get_le16(&gb), 16);

             } else {
                 current_sample  = c->status[channel].predictor;
                 previous_sample = c->status[channel].prev_sample;
             }
 

             for (count1 = 0; count1 < nb_samples / 28; count1++) {

                 int byte = bytestream2_get_byte(&gb);
                 if (byte == 0xEE) {  /* only seen in R2 and R3 */
                     current_sample  = sign_extend(bytestream2_get_be16(&gb), 16);
                     previous_sample = sign_extend(bytestream2_get_be16(&gb), 16);

 
                     for (count2=0; count2<28; count2++) {

                         *samplesC = sign_extend(bytestream2_get_be16(&gb), 16);

                         samplesC += avctx->channels;
                     }
                 } else {

                     coeff1 = ea_adpcm_table[ byte >> 4     ];
                     coeff2 = ea_adpcm_table[(byte >> 4) + 4];
                     shift = 20 - (byte & 0x0F);

 
                     for (count2=0; count2<28; count2++) {
                         if (count2 & 1)

                             next_sample = sign_extend(byte,    4) << shift;
                         else {
                             byte = bytestream2_get_byte(&gb);
                             next_sample = sign_extend(byte >> 4, 4) << shift;
                         }

 
                         next_sample += (current_sample  * coeff1) +
                                        (previous_sample * coeff2);
                         next_sample = av_clip_int16(next_sample >> 8);
 
                         previous_sample = current_sample;
                         current_sample  = next_sample;
                         *samplesC = current_sample;
                         samplesC += avctx->channels;
                     }
                 }
             }

             if (!count) {
                 count = count1;
             } else if (count != count1) {
                 av_log(avctx, AV_LOG_WARNING, "per-channel sample count mismatch\n");
                 count = FFMAX(count, count1);
             }

             if (avctx->codec->id != AV_CODEC_ID_ADPCM_EA_R1) {

                 c->status[channel].predictor   = current_sample;
                 c->status[channel].prev_sample = previous_sample;
             }
         }
 

         c->frame.nb_samples = count * 28;

         bytestream2_seek(&gb, 0, SEEK_END);

         break;
     }

     case AV_CODEC_ID_ADPCM_EA_XAS:

         for (channel=0; channel<avctx->channels; channel++) {
             int coeff[2][4], shift[4];
             short *s2, *s = &samples[channel];
             for (n=0; n<4; n++, s+=32*avctx->channels) {

                 int val = sign_extend(bytestream2_get_le16u(&gb), 16);

                 for (i=0; i<2; i++)

                     coeff[i][n] = ea_adpcm_table[(val&0x0F)+4*i];
                 s[0] = val & ~0x0F;
 
                 val = sign_extend(bytestream2_get_le16u(&gb), 16);
                 shift[n] = 20 - (val & 0x0F);
                 s[avctx->channels] = val & ~0x0F;

             }
 
             for (m=2; m<32; m+=2) {
                 s = &samples[m*avctx->channels + channel];

                 for (n=0; n<4; n++, s+=32*avctx->channels) {
                     int byte = bytestream2_get_byteu(&gb);

                     for (s2=s, i=0; i<8; i+=4, s2+=avctx->channels) {

                         int level = sign_extend(byte >> (4 - i), 4) << shift[n];

                         int pred  = s2[-1*avctx->channels] * coeff[0][n]
                                   + s2[-2*avctx->channels] * coeff[1][n];
                         s2[0] = av_clip_int16((level + pred + 0x80) >> 8);
                     }
                 }
             }
         }
         break;

     case AV_CODEC_ID_ADPCM_IMA_AMV:
     case AV_CODEC_ID_ADPCM_IMA_SMJPEG:
         if (avctx->codec->id == AV_CODEC_ID_ADPCM_IMA_AMV) {

             c->status[0].predictor = sign_extend(bytestream2_get_le16u(&gb), 16);
             c->status[0].step_index = bytestream2_get_le16u(&gb);
             bytestream2_skipu(&gb, 4);

         } else {

             c->status[0].predictor = sign_extend(bytestream2_get_be16u(&gb), 16);
             c->status[0].step_index = bytestream2_get_byteu(&gb);
             bytestream2_skipu(&gb, 1);
         }
         if (c->status[0].step_index > 88u) {
             av_log(avctx, AV_LOG_ERROR, "ERROR: step_index = %i\n",
                    c->status[0].step_index);
             return AVERROR_INVALIDDATA;

         }

         for (n = nb_samples >> (1 - st); n > 0; n--) {
             int hi, lo, v = bytestream2_get_byteu(&gb);

             if (avctx->codec->id == AV_CODEC_ID_ADPCM_IMA_AMV) {

                 hi = v & 0x0F;
                 lo = v >> 4;
             } else {
                 lo = v & 0x0F;
                 hi = v >> 4;
             }

             *samples++ = adpcm_ima_expand_nibble(&c->status[0], lo, 3);
             *samples++ = adpcm_ima_expand_nibble(&c->status[0], hi, 3);

         }
         break;

     case AV_CODEC_ID_ADPCM_CT:

         for (n = nb_samples >> (1 - st); n > 0; n--) {
             int v = bytestream2_get_byteu(&gb);

             *samples++ = adpcm_ct_expand_nibble(&c->status[0 ], v >> 4  );
             *samples++ = adpcm_ct_expand_nibble(&c->status[st], v & 0x0F);

         }
         break;

     case AV_CODEC_ID_ADPCM_SBPRO_4:
     case AV_CODEC_ID_ADPCM_SBPRO_3:
     case AV_CODEC_ID_ADPCM_SBPRO_2:

         if (!c->status[0].step_index) {
             /* the first byte is a raw sample */

             *samples++ = 128 * (bytestream2_get_byteu(&gb) - 0x80);

             if (st)

                 *samples++ = 128 * (bytestream2_get_byteu(&gb) - 0x80);

             c->status[0].step_index = 1;

             nb_samples--;

         }

         if (avctx->codec->id == AV_CODEC_ID_ADPCM_SBPRO_4) {

             for (n = nb_samples >> (1 - st); n > 0; n--) {
                 int byte = bytestream2_get_byteu(&gb);

                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],

                                                        byte >> 4,   4, 0);

                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[st],

                                                        byte & 0x0F, 4, 0);

             }

         } else if (avctx->codec->id == AV_CODEC_ID_ADPCM_SBPRO_3) {

             for (n = nb_samples / 3; n > 0; n--) {
                 int byte = bytestream2_get_byteu(&gb);

                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],

                                                         byte >> 5        , 3, 0);

                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],

                                                        (byte >> 2) & 0x07, 3, 0);

                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],

                                                         byte & 0x03,       2, 0);

             }
         } else {

             for (n = nb_samples >> (2 - st); n > 0; n--) {
                 int byte = bytestream2_get_byteu(&gb);

                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],

                                                         byte >> 6        , 2, 2);

                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[st],

                                                        (byte >> 4) & 0x03, 2, 2);

                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],

                                                        (byte >> 2) & 0x03, 2, 2);

                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[st],

                                                         byte & 0x03,       2, 2);

             }
         }
         break;

     case AV_CODEC_ID_ADPCM_SWF:

         adpcm_swf_decode(avctx, buf, buf_size, samples);
         bytestream2_seek(&gb, 0, SEEK_END);

         break;

     case AV_CODEC_ID_ADPCM_YAMAHA:

         for (n = nb_samples >> (1 - st); n > 0; n--) {
             int v = bytestream2_get_byteu(&gb);

             *samples++ = adpcm_yamaha_expand_nibble(&c->status[0 ], v & 0x0F);
             *samples++ = adpcm_yamaha_expand_nibble(&c->status[st], v >> 4  );

         }
         break;

     case AV_CODEC_ID_ADPCM_THP:

     {

         int table[2][16];

         int prev[2][2];

         int ch;
 

         for (i = 0; i < 2; i++)
             for (n = 0; n < 16; n++)
                 table[i][n] = sign_extend(bytestream2_get_be16u(&gb), 16);

 
         /* Initialize the previous sample.  */

         for (i = 0; i < 2; i++)
             for (n = 0; n < 2; n++)
                 prev[i][n] = sign_extend(bytestream2_get_be16u(&gb), 16);

 
         for (ch = 0; ch <= st; ch++) {

             samples = (short *)c->frame.data[0] + ch;

 
             /* Read in every sample for this channel.  */

             for (i = 0; i < nb_samples / 14; i++) {

                 int byte = bytestream2_get_byteu(&gb);
                 int index = (byte >> 4) & 7;
                 unsigned int exp = byte & 0x0F;

                 int factor1 = table[ch][index * 2];
                 int factor2 = table[ch][index * 2 + 1];

 
                 /* Decode 14 samples.  */
                 for (n = 0; n < 14; n++) {

                     int32_t sampledat;

 
                     if (n & 1) {
                         sampledat = sign_extend(byte, 4);
                     } else {
                         byte = bytestream2_get_byteu(&gb);
                         sampledat = sign_extend(byte >> 4, 4);
                     }

                     sampledat = ((prev[ch][0]*factor1

                                 + prev[ch][1]*factor2) >> 11) + (sampledat << exp);

                     *samples = av_clip_int16(sampledat);

                     prev[ch][1] = prev[ch][0];
                     prev[ch][0] = *samples++;

 
                     /* In case of stereo, skip one sample, this sample
                        is for the other channel.  */
                     samples += st;
                 }
             }
         }
         break;

     }

     default:
         return -1;
     }

 
     *got_frame_ptr   = 1;
     *(AVFrame *)data = c->frame;
 

     return bytestream2_tell(&gb);

 }
 

 #define ADPCM_DECODER(id_, name_, long_name_)               \
 AVCodec ff_ ## name_ ## _decoder = {                        \
     .name           = #name_,                               \
     .type           = AVMEDIA_TYPE_AUDIO,                   \
     .id             = id_,                                  \
     .priv_data_size = sizeof(ADPCMDecodeContext),           \
     .init           = adpcm_decode_init,                    \
     .decode         = adpcm_decode_frame,                   \

     .capabilities   = CODEC_CAP_DR1,                        \

     .long_name      = NULL_IF_CONFIG_SMALL(long_name_),     \

 }

 /* Note: Do not forget to add new entries to the Makefile as well. */

 ADPCM_DECODER(AV_CODEC_ID_ADPCM_4XM, adpcm_4xm, "ADPCM 4X Movie");
 ADPCM_DECODER(AV_CODEC_ID_ADPCM_CT, adpcm_ct, "ADPCM Creative Technology");
 ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA, adpcm_ea, "ADPCM Electronic Arts");
 ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA_MAXIS_XA, adpcm_ea_maxis_xa, "ADPCM Electronic Arts Maxis CDROM XA");
 ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA_R1, adpcm_ea_r1, "ADPCM Electronic Arts R1");
 ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA_R2, adpcm_ea_r2, "ADPCM Electronic Arts R2");
 ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA_R3, adpcm_ea_r3, "ADPCM Electronic Arts R3");
 ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA_XAS, adpcm_ea_xas, "ADPCM Electronic Arts XAS");
 ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_AMV, adpcm_ima_amv, "ADPCM IMA AMV");
 ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_APC, adpcm_ima_apc, "ADPCM IMA CRYO APC");
 ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_DK3, adpcm_ima_dk3, "ADPCM IMA Duck DK3");
 ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_DK4, adpcm_ima_dk4, "ADPCM IMA Duck DK4");
 ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_EA_EACS, adpcm_ima_ea_eacs, "ADPCM IMA Electronic Arts EACS");
 ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_EA_SEAD, adpcm_ima_ea_sead, "ADPCM IMA Electronic Arts SEAD");
 ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_ISS, adpcm_ima_iss, "ADPCM IMA Funcom ISS");
 ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_QT, adpcm_ima_qt, "ADPCM IMA QuickTime");
 ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_SMJPEG, adpcm_ima_smjpeg, "ADPCM IMA Loki SDL MJPEG");
 ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_WAV, adpcm_ima_wav, "ADPCM IMA WAV");
 ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_WS, adpcm_ima_ws, "ADPCM IMA Westwood");
 ADPCM_DECODER(AV_CODEC_ID_ADPCM_MS, adpcm_ms, "ADPCM Microsoft");
 ADPCM_DECODER(AV_CODEC_ID_ADPCM_SBPRO_2, adpcm_sbpro_2, "ADPCM Sound Blaster Pro 2-bit");
 ADPCM_DECODER(AV_CODEC_ID_ADPCM_SBPRO_3, adpcm_sbpro_3, "ADPCM Sound Blaster Pro 2.6-bit");
 ADPCM_DECODER(AV_CODEC_ID_ADPCM_SBPRO_4, adpcm_sbpro_4, "ADPCM Sound Blaster Pro 4-bit");
 ADPCM_DECODER(AV_CODEC_ID_ADPCM_SWF, adpcm_swf, "ADPCM Shockwave Flash");
 ADPCM_DECODER(AV_CODEC_ID_ADPCM_THP, adpcm_thp, "ADPCM Nintendo Gamecube THP");
 ADPCM_DECODER(AV_CODEC_ID_ADPCM_XA, adpcm_xa, "ADPCM CDROM XA");
 ADPCM_DECODER(AV_CODEC_ID_ADPCM_YAMAHA, adpcm_yamaha, "ADPCM Yamaha");